Ignore singletons

1 files changed, 4 insertions, 0 deletions

diff --git a/synapse/util/caches/lrucache.py b/synapse/util/caches/lrucache.py

index fdf3b726b0..b018733288 100644
--- a/synapse/util/caches/lrucache.py
+++ b/synapse/util/caches/lrucache.py
@@ -44,6 +44,10 @@ try:
             recurse: If true will include referenced values in the size,
                 otherwise only sizes the given object.
         """
+        # Ignore singleton values when calculating memory usage.
+        if val in ((), None, ""):
+            return 0
+
         sizer = Asizer()
         sizer.exclude_refs((), None, "")
         return sizer.asizeof(val, limit=100 if recurse else 0)